Biltmore Estate

In the 1880s George Washington Vanderbilt II, the youngest grandson of railroad tycoon Cornelius Vanderbilt, fell in love with the Blue Ridge Mountains around Asheville. Where his siblings built summer cottages in Newport, George dreamed bigger: a working European-style estate. He hired Richard Morris Hunt to design a Châteauesque mansion modelled on the Loire Valley's great châteaux, and Frederick Law Olmsted — the man behind Central Park — to shape the grounds. Construction began in 1889 and took six years and around a thousand workers.

The numbers remain unmatched in American domestic architecture: 178,926 square feet of floor space, 250 rooms, 35 bedrooms, 43 bathrooms, 65 fireplaces. The Banquet Hall soars 70 feet; the collection holds Monets and Renoirs alongside Tiffany glass. It was also a machine for modern living — electric elevators, central heating, an indoor pool — and the 8,000-acre estate (once 125,000) pioneered American forestry, hosting one of the country's first forestry schools.

George opened the house to family and friends on Christmas Eve 1895; he died in 1914, and in 1930 his widow Edith did something radical to keep it alive — she opened it to paying visitors. Nearly a century later it still works: still family-owned, still the largest privately owned house in America, and still the definitive monument to the Gilded Age.